WO1991017101A1 - Device for the uncontained transfer of throwable material from a feed point to a destination point - Google Patents

Abstract

The device (1) disclosed comprises a driven thrower wheel (8) with scoop blades (10). The thrower wheel (8) is open at the circumference, but most of its circumference (13) is covered by a continuous belt (14) which also passes round guide rollers (15, 16, 17). Between the roller (15) which places the belt (14) round the thrower wheel (8) and the roller (16) which lifts the belt (14) away from the thrower wheel (8) is an uncovered section (22) of the circumference through which material (M) can pass out radially in a directional jet. A material deflector (28) can be mounted in the area in which the belt (14) comes on to the thrower wheel (8). The material (M) is fed in through a feed pipe (20) from which it emerges through an opening (21) in a defined direction into the thrower wheel (8) level with the scoop blades (10).

Description

 Device for the wire-free transfer of spinable material from a task to a destination

The invention relates to a device for the wire-free transfer of spinable material from a task to a destination, in particular in underground mining, according to the features in the preamble of patent claim 1.

In a known device, the task consists of a funnel above the central area of the centrifugal wheel. From this funnel, the material to be transferred reaches the centrifugal wheel via an eccentric segment-like opening in the bottom of the funnel. This has an upper annular disc, the central recess of which corresponds to the diameter of the funnel at the lower end. At a distance to the ring disc is the closed bottom of the centrifugal wheel, which has a substantially conical deflection hub in the center, which extends over about 3/4 of the height of the centrifugal wheel. The surface of the deflection hub is concavely curved. The annular disk and the bottom of the centrifugal wheel are spaced apart by straight-line blades which, starting from the periphery of the centrifugal wheel, extend over approximately 1/4 of the diameter of the centrifugal wheel. The blades are inclined at an angle to a plane that extends from the circumference of the centrifugal wheel over the axis of rotation of the centrifugal wheel.

A housing belt is provided on the start side of the centrifugal wheel. This is guided over a total of six deflection rollers, of which two deflection rollers laterally limit a discharge section of the centrifugal wheel. One of these limiting rollers is designed as a drive for the housing belt, which at the same time also drives the centrifugal wheel.

The centrifugal wheel and the housing belt are mounted in a housing, the curved side wall of which partly also surrounds the deflection rollers that delimit the discharge section.

The material which is eccentrically fed into the centrifugal wheel via the funnel is deflected at the deflection hub into the plane of the centrifugal wheel and is displaced from the blades to the housing belt under the action of the centrifugal force. Here the material is carried along by the housing belt and then discharged radially via the discharge section.

A disadvantage of the known device is that the material gets into the centrifugal wheel off-center and therefore no targeted alignment is possible on the inflow side. Rather, the material is initially relative to that Slip through the centrifugal wheel base, then gripped by the blades at an unpredictable point and move in an uncontrolled directionless manner in the entire area of the centrifugal wheel, so that damage to the device cannot be avoided. In particular, however, the area is subjected to extremely high abrupt stresses in which the housing belt is pressed against the centrifugal wheel again. In addition, very strong shear stresses will inevitably occur if the peripheral edge of a blade comes into contact with the housing belt again and material components are clamped in between the blade edge, the deflection roller and the housing belt at this time. The service life of the flexible housing strap is inevitably very limited. It can also not be prevented by the drive of the housing belt that relative movements of the housing belt and the centrifugal wheel occur even with slight jamming, which likewise result in increased wear.

On the basis of the features described in the preamble of claim 1, the invention is based on the object of improving such a device in such a way that both lumpy and granular as well as liquid-pasty material with considerably less wear on the housing belt and on the centrifugal wheel while adhering to them properly Function can be transferred from a task to a destination.

This object is achieved according to the invention in the features listed in the characterizing part of claim 1.

Then it is now ensured on the inflow side of the centrifugal wheel that the material is axially fed in at the location of the slightest force in the center of the centrifugal wheel. Because here no or only a low peripheral speed there is little shear force, wear in this area can also be kept to a minimum. In addition, the orientation of the material on the inflow side has the advantage that the area in which the housing belt is newly attached to the centrifugal wheel on the circumferential side and specifically forms a jacket-side boundary of the centrifugal wheel is specifically excluded from exposure to the material. The orientation on the inflow side ensures that the material moves within the blade plane on predetermined tracks. In this way, the areas on the outer circumference of the centrifugal wheel that are subject to extremely high wear can be left out. Consequently, no material can become trapped in the gusset, in which the housing belt rests against the centrifugal wheel on the circumferential side, and excessive wear of the housing belt on the one hand or of the centrifugal wheel on the other hand can result. This is particularly important because the forces and speeds acting on the outer circumference are many times higher than on the inner diameter, depending on the diameter and speed of the centrifugal wheel.

The invention therefore creates the precondition for the material to be transferred in a directed way from the axial inflow region to the discharge region of the centrifugal wheel, which is not encased by the housing belt, and to be able to emerge here in a predetermined bundling. The material is moved gently and positively from the location of the material supply to the outside with constantly increasing acceleration. The material on the centrifugal wheel circumference then has the same circumferential speed as the housing belt, so that ideally there is no longer any relative movement between the material and housing belt and therefore no wear. The casing belt enveloping the centrifugal wheel on the vast majority of the circumference has only a leading and no accelerating function. In contrast, In addition to the generic type, any uncontrolled movement of the material to be transferred is avoided all the way from the axial feed to the bundled radial outlet. It is also important that the deflection rollers that laterally delimit the circumferential area of the centrifugal wheel that is not encased by the housing belt can be adjusted in terms of their spacing so specifically to the material to be transferred that a bundled outlet can always be achieved to the desired extent. The service life of the device, in particular in the area where the housing belt runs again onto the centrifugal wheel, is consequently increased considerably.

An advantageous embodiment of the invention for transferring lumpy and granular material is seen in the features of claim 2. There is therefore an outflow opening in the height region of the blades, which transfers the material into the blade plane in such a way that the extremely endangered area of the device, namely the reinstallation of the housing belt on the circumference of the centrifugal wheel, is spared by the material loading and not abruptly stressed by the material - »can be grounded. The size of the outflow opening and its position relative to the deflection roller, which again places the housing belt on the circumference of the centrifugal wheel, depends on the character or quality of the material, on the material-specific coefficient of friction of the centrifugal wheel and on the constructional dimensions of the device, in particular the distance of the outflow opening to the circumference of the centrifugal wheel.

The features of patent claim 3 can be used with advantage when, in particular, liquid-pasty material is to be transferred from a task to a destination in free throw. The deflection hub can have an essentially conical cross section with a concave surface exhibit. Since the deflecting boss projects into the feed nozzle, the material is still taken over by the centrifugal wheel in the feed nozzle and passed on. The upper edges of the blades in the inlet area of the material into the centrifugal wheel can be given such a shape that the redirection of the volume flow from the axial to the radial direction and the start of the acceleration phase of the material are favored with little wear. Furthermore, it is conceivable that on the feed side of the material mixing devices, feed devices supporting conveying devices or comminution devices are arranged, through which the material flows before it enters the centrifugal wheel. The speed of the conveying, mixing and comminuting devices can correspond to that of the centrifugal wheel.

The features of patent claim 4 serve to additionally protect the reinstallation area of the housing belt on the centrifugal wheel. The inside of the material deflector is adapted to the contour of the centrifugal wheel and prevents material components in the gusset between the housing belt and the centrifugal wheel Pinching the idler pulley and the centrifugal wheel and can permanently damage the housing belt or centrifugal wheel. On the side facing away from the centrifugal wheel, the material deflector is designed in a wedge shape starting from the circumference of the centrifugal wheel, in order to contribute to the bundling of the material with its outside.

An advantageous embodiment of the bundling means on the discharge side characterizes the features of claim 5. The bundling of the emerging material takes place in accordance with its exit speed and its nature. The shape of the side faces of the connecting piece lying in the plane of the centrifugal wheel and their mutual assignment are chosen such that there is as little contact as possible done with the material. This is particularly important in the case of granular material or substances which contain granular components, so that the grains do not touch the side surfaces at all or only rarely when exiting, since reflections would lead to a fanning out of the bundled beam. The neck is designed in the area of the circumference of the centrifugal wheel so that material components that do not emerge through the neck are properly guided back into the centrifugal wheel and not in the endangered gusset between the housing belt which is again attached to the centrifugal wheel and the Can reach the centrifugal wheel.

The features of claim 6 can be used to further improve the beam-shaped bundling on the discharge side.

A further embodiment of the bundling means on the discharge side consists in the features of patent claim 7. In this case, surfaces moving with the material to be discharged lie opposite one another, which largely avoid friction between the material and the housing belt or the bundling belt. Also, even with granular material, the fanning processes that promote fanning can no longer occur. It is entirely conceivable that the longitudinal section of the housing belt that extends tangentially to the circumference of the centrifugal wheel can be used alone or together with the bundling belt.

The features of claim 8 serve to improve the bundling effect.

Furthermore, in order to optimally adapt the bundling effect to the material to be enforced, it may be possible to use the mouth of the opposite length sections deflection rollers of the housing belt and the bundling belt located transversely displaceable according to claim 9. In this way, the relative position of the housing strap and the bundling strap can be optimally adjusted for each application.

According to the features of patent claim 10, the centrifugal wheel is preferably driven via a belt drive from a drive motor. After that, the housing belt is not driven itself, but is taken along by the centrifugal wheel. Corresponding tensioning devices ensure the proper slip-free contact of the housing belt on the centrifugal wheel.

Nevertheless, under certain operational circumstances, it can make sense to also drive at least one of the deflection rollers for the housing belt by means of a motor. The drive of the housing belt serves to avoid slippage between the housing belt and the blower wheel.

The drives for the centrifugal wheel and / or the housing belt can be electrical, pneumatic or hydraulic in nature.

In order to increase the service life of the housing belt, it may be appropriate, according to the features of claim 12, to provide the housing belt with wear protection on the side facing the centrifugal wheel.

Since wear has to be expected on the centrifugal wheel after a longer period of operation, which leads to irregular material removal and thus, at high rotational speeds of the centrifugal wheel, to mass forces that appear as unbalance, sensors can be arranged at at least one bearing point of the centrifugal wheel. determine the forces resulting from the mass imbalance of the rapidly rotating centrifugal wheel. The measured values of the Balance sensors can then be converted into adjustment pulses to eliminate the unbalance by at least one mass balancing device attached to the centrifugal wheel.

The device according to the invention for the wire-free transfer of spinable material from a task to a destination can be used advantageously in many areas. One area is e.g. underground mining, especially the backfilling of the cavities that are necessary for the extraction of valuable minerals. Examples of this are the backfilling of the cavities created in the longwall when building the long front and the accompanying stretches and the backfilling of chambers when building the pillar. However, the invention can also be used for the production of line accompanying dams, for the application of adhesive material to surfaces or for the relocation of piled-up material to another location. Furthermore, the device can be used in landfill technology, for loading and unloading freight wagons and ships. Such devices can also be used for the introduction of shotcrete. It is also possible to

Use device as post-accelerator of hydraulically conveyed or pumped solid. In addition, it is conceivable that such a device can be used for wildfires. There it has proven to be advantageous to use solid, granular or granulated extinguishing agents which are thrown into the conflagration and develop gases when heated which suffocate the flames. Ultimately, it is conceivable that the facility can be used to a greater extent in bulk handling and in agriculture.

The invention is explained in more detail below on the basis of exemplary embodiments illustrated in the drawings. Show it: Figure 1 in perspective, partly in section, a device for transferring spinable material from a task to a destination;

Figure 2 in plan the use of the device according to

Figure 1 in a strut of underground mining;

3 shows a centrifugal wheel of the device according to FIG. 1 in perspective detail;

Figure 4 is a side view of a feed nozzle for the centrifugal wheel of Figure 3;

5 shows a horizontal cross section through the representation of FIG. 4 along the line V-V;

FIG. 6 in vertical cross section a further embodiment of the device of FIG. 1;

FIG. 7 shows a schematic plan view of a third embodiment of the device in FIG. 1;

Figure 8 is a schematic plan view of a fourth embodiment of the device of Figures 1 and

FIG. 9 shows, in a schematic plan view, a fifth embodiment of the device in FIG. 1.

1 in FIGS. 1 and 2 denotes a device for transferring granular material M which can be spun from a task to a destination. According to Figure 2 For example, the task can consist of a conveyor belt 2 and the destination from the offset area 3 of a strut 4.

The device 1 comprises a housing 5 which, according to the double arrow 6 in FIG. 2, can be displaced in the longitudinal direction of the strut 4 and can also be pivoted about an axis 7. In the housing 5, see also FIG. 7, a centrifugal wheel 8 is arranged so as to be rotatable about an axis 9. The centrifugal wheel 8 is open radially and has blades 10 which are concavely curved in the direction of rotation. As FIG. 1 also shows, the centrifugal wheel 8 is driven via a belt drive 11 by an electric motor 12, which is likewise arranged in the housing 5.

On the major part of its circumference 13 (FIGS. 1 and 7), the centrifugal wheel 8 is covered by an endless housing belt 14 in a jacket-like manner. In addition, the housing belt 14 wraps around a total of three deflection rollers 15-17, the deflection roller 15 applying the housing belt 14 to the circumference 13 of the centrifugal wheel 8 and the deflection roller 16 lifting the housing belt 14 off the centrifugal wheel 8. The third deflection roller 17 can be relatively displaceable with its axis 18 in order to be able to tension the housing belt 14.

As can be seen in FIG. 6, it is also possible to provide the housing belt 14 with wear protection 19 on the side facing the centrifugal wheel 8.

When considering the embodiment of FIGS. 1 and 3 to 5 together, which is preferably used for the transfer of lumpy or granular material M, it can be seen that a cylindrical feed nozzle 20, which is fixed in the housing 5, opens into the centrifugal wheel 8 and to which the centrifugal wheel 8 can move relatively. In the high range of The feed nozzle 20 is provided with blades 10 with a radially directed outflow opening 21, via which the material M passes from the feed nozzle 20 into the centrifugal wheel 8. The size and relative position of the outflow opening 21 to the circumferential section 22 of the centrifugal wheel 8 which is not encased by the housing belt 14 (see also FIG. 7) depends on the material M to be transferred, the distance of the feed connector 20 from the circumference 13 of the centrifugal wheel 8 and on the material-specific Coefficient of friction of the centrifugal wheel 8.

The embodiment in FIG. 6 shows a non-rotating feed nozzle 23 which opens axially into the centrifugal wheel 8 and which is widened radially at the entry into the centrifugal wheel 8. A central deflection hub 25 of the centrifugal wheel 8 projects into the widened nozzle section 24. This essentially conical deflection hub 25 has a concave surface 26.

Furthermore, the upper edges 27 of the blades 10 in the entry region of the material M into the centrifugal wheel 8 are designed in such a way that the least possible wear can occur. This embodiment is preferably suitable for liquid-pasty material M.

It can be seen from FIG. 7 that the discharge-side circumferential section 22 of the centrifugal wheel 8 not covered by the housing belt 14 is partially covered by a material deflector 28. This material deflector 28 prevents constituents of the material M from being pinched in the gusset 29 between the deflection roller 15 and the centrifugal wheel 8 which attach the housing belt 14 to the centrifugal wheel 8 again. In the embodiment of FIG. 8, which has, for example, four deflection rollers 15, 16, 30, 31 for the housing belt 14 (the housing itself is not shown), there is a peripheral section which is not encased and laterally delimited by the deflection rollers 15, 16 22 approximately tangentially adjoining tubular connecting piece 32 is provided as a bundling means on the discharge side. The nozzle 32 tapers conically towards the discharge mouth 33. The gusset 29 is again covered by a material deflector 28.

Within the scope of the embodiment in FIG. 9, the bundling means on the discharge side are formed by a length section 34 of the housing belt 14 extending tangentially to the circumference 13 of the centrifugal wheel 8 and by a length section 35 lying frontally opposite this length section 34 of a bundling which runs endlessly over deflection rollers 36, 37 ¬ belts 38 formed. The housing belt 14 is guided over a total of five guide rollers 15, 16, 30, 31, 39. The deflection rollers 36, 37 for the bundling belt 38 are driven individually or jointly in such a way that the two longitudinal sections 34, 35 move with the material M. In this embodiment too, the gusset 29 is covered by a material deflector 28.

It can also be seen from FIG. 9 that the opposite longitudinal sections 34, 35 of the housing belt 14 and the bundling belt 38 run at an angle to one another. The deflection rollers 16, 37 of the housing belt 14 and of the bundling belt 38 located on the mouth side of the opposite length sections 34, 35 can be transversely displaceable in accordance with the arrows PF. In the embodiments of FIGS. 8 and 9, the blades 10 of the centrifugal wheels 8 are aligned radially in a straight line. The centrifugal wheels 8 and the housing belts 14 are driven analogously to the embodiment in FIG. 1. The same situation applies to the illustration in FIG.

REFERENCE NUMBERS

1 - Setup

2 - conveyor belt

3 - offset range from 4

4 - buttress

5 - Housing v. 1

6 - double arrow

7 - axis v. 5

8 - centrifugal wheel

9 - axis v. 8th

10 - shovels

11 - belt drive

12 - electric motor

13 - scope of 8th

14 - Housing strap

15 - pulley

16 - pulley

17 - pulley

18 - axis v. 17

19 - Wear protection

20 - feed connector

21 - outflow opening from 20th

22 - peripheral section

23 - feed connector

24 - nozzle section

25 - deflection hub

26 - surface of 25

27 - upper edges of 10

28 - Material deflector

29 - gusset

30 - pulley 31 - pulley

32 - neck

33 - mouth of 32

34 - length section from 14

35 - section of v. 14

36 - pulley

37 - pulley

38 - Bundling strap

39 - pulley

M material PF arrows

Claims

Claims 1. Device for the wire-free transfer of centrifugal material (M) from a task (2) to a destination (3), in particular in underground mining, which has a radially open centrifugal wheel rotating about an axis (9) ( 8) with substantially radially extending blades (10) and a housing belt (14), the material (M) being able to be fed axially to the centrifugal wheel (8) and being discharged radially, characterized in that the centrifugal wheel (8) on the The vast majority of its circumference (13) is encased by an endless housing belt (14) rotating at the same speed, and that means (20, 21!) for the directional introduction of the material (M) into the blade plane and / on the inflow side of the centrifugal wheel (8) or means (28, 32, 34, 35) for the beam-shaped bundling of the material (M) are provided on the discharge side in the region of the uncovered peripheral section (22) of the centrifugal wheel (8) d. 2. Device according to claim 1, characterized in that the inflow-side directional means through an axially opening into the centrifugal wheel (8), do not rotate the supply nozzle (20) with a radially directed outflow opening located in the height region of the blades (10) ( 21) are formed. 3. Device according to claim 1, characterized ¬ characterized in that an axially in the centrifugal wheel (8) opening, non-rotating feed connector (23) at the entrance to the centrifugal wheel (8) is radially expanded and in the expanded nozzle section (24) a central deflection hub (25) of the centrifugal wheel (8) protrudes. 4. Device according to claim 1, so that the discharge-side peripheral section (22) of the centrifugal wheel (8) not encased by the housing belt (14) is partially covered by a material deflector (28). 5. Device according to claim 1 or 4, d a d u r c h g e ¬ k e n n z e i c h n e t that the discharge-side bundling means by one on the uncoated and laterally by two deflection rollers (15, 16) of the housing belt (14) limited peripheral section (22) are formed approximately tangentially adjoining tubular connecting pieces (32). 6. Device according to claim 5, so that the nozzle (32) towards the discharge mouth (33) is conically tapered. 7. Device according to claim 1 or 4, dadurchge ¬ indicates that the discharge-side bundling means by a tangent to the circumference (13) of the centrifugal wheel (8) extending length section (34) of the housing belt (14) and by this length section (34th ) frontally opposite length section (35) of a bundling belt (38) which is endlessly running around deflection rollers (36, 37). 8. Device according to claim 7, so that the opposite length sections (34, 35) of the housing belt (14) and the bundling belt (38) run at an angle to one another. 9. Device according to claim 7 or 8, d a d u r c h g e ¬ k e n n z e i c h n t that the mouth side of the opposite length sections (34, 35) located deflection rollers (16, 37) of the housing belt (14) and the bundling belt (38) are transversely displaceable. 10. Device according to one of claims 1 to 9, since - characterized in that the Schleuder¬ wheel (8) and drivingly attached to this Ge housing belt (14) via a belt drive (11) from one next to the centrifugal wheel (8) and next to the housing belt (14) arranged motor (12) are driven out. 11. Device according to one of claims 1 to 10, d a ¬ d u r c h g e k e n n z e i c h n e t that at least one of the guide rollers (15-17, 30, 31, 39) for the housing belt (14) is driven. 12. Device according to one of claims 1 to 11, that the housing belt (14) is provided with a wear protection (19) on the side facing the centrifugal wheel (8).